Viscous damper having a conical plunger tube

Abstract

A damper which comprises a damper housing and a damper plunger in which the damper plunger comprises a top plate for the reception of an object that is to be damped, and a plunger tube. The plunger tube is frustoconical in configuration and can be moved into and out of a damping medium present in the damper housing, the larger cone diameter end of the plunger tube being directed into the damper medium.

I claim: 
     
       1. A vibration damper for an object that is to be mounted so as to be elastically yielding comprising: a damper housing containing a viscous damper medium;   a damper plunger having a top plate for the reception of the object and a plunger tube positionable for moving into and out of said damper housing and said viscous damper medium, wherein said plunger tube defines as downwardly open, hollow and continuously conical frustrum, a small diameter end of said frustrum facing said top plate and a large diameter end of said frustrum extending into said damper housing, and   a plurality of small diameter circulation bores extending through the conical surface of said continuously conical frustrum, whereby said viscous damper medium is throttled by circulation through said bores.   
     
     
       2. A vibration damper as claimed in claim 1 wherein said circulation bores lie at a distance below a surface of the damping medium which is greater than the largest vibration amplitude. 
     
     
       3. A vibration damper as claimed in claim 1, including air balance holes arranged in the conical plunger tube, at a larger spacing than the largest vibration amplitude above the surface of the damping medium. 
     
     
       4. A vibration damper as claimed in claims 1, 2 or 3 wherein said larger cone diameter end of the plunger tube is closed off by a closure plate which is provided with passage apertures, and the plunger tube is closed off approximately in the region of the surface of the damping medium by a respective closure sheet. 
     
     
       5. A vibration damper as claimed in claim 1 including additional inner tubes arranged in the plunger tube. 
     
     
       6. A vibration damper according to claim 5, wherein the inner tubes are welded together into a tube bank and with a center support continuing up to an end cover. 
     
     
       7. A vibration damper as claimed in claim 1 wherein the cone angle of the plunger tube is in the range of 50° to 70°. 
     
     
       8. A vibration damper as claimed in claim 1 wherein the top plate and a bottom plate are connected to one another by way of helical compression springs which extend parallel to the axis of the damper housing and outside the latter. 
     
     
       9. A vibration damper as claimed in claim 1 wherein the cone angle of the plunger tube is 60°.